It Is Generally Accepted That Vertebrates Do Not Utilize RNAi

Multiple Choice

It is generally accepted that vertebrates do not utilize RNAi as a defense against viruses for what reason?

A) Vertebrates have no serious viral infections.
B) Vertebrate cell membranes resist viral attachment.
C) Vertebrate cell walls resist viral attachment.
D) Vertebrates rely instead on a well-developed immune system.